vim-patch:9.1.1939: tests: test_matchfuzzy() leaves swapfiles behind

Problem:  tests: test_matchfuzzy() leaves swapfiles behind
Solution: Close loaded buffers using "%bw"

https://github.com/vim/vim/commit/6e9694df10a32cfe3314c2487f4f0110c4d3de67

Co-authored-by: Christian Brabandt <cb@256bit.org>

test/old/testdir/test_matchfuzzy.vim

@@ -62,6 +62,7 @@ func Test_matchfuzzy()
   let l = getbufinfo()->map({_, v -> fnamemodify(v.name, ':t')})->matchfuzzy('ndl')
   call assert_equal(1, len(l))
   call assert_match('needle', l[0])
+  %bw!
 
   " Test for fuzzy matching dicts
   let l = [{'id' : 5, 'val' : 'crayon'}, {'id' : 6, 'val' : 'camera'}]